A professional who repairs and maintains mail-processing equipment, such as letter-canceling machines, letter-facing-and-canceling machines, mail-sorting machines, and conveyor systems, following blueprints and schematic diagrams, using handtools, power tools, and electrical testing instruments. Responsibilities include:

• Inspects machine to locate causes of trouble, using ammeters, ohmmeters, relay testers, and other testing instruments.
• Dismantles machine, using handtools and power tools.
• Repairs wiring circuits and replaces parts, such as relays, resistors, condensers, and rheostats in electrical systems, using handtools.
• Repairs and replaces parts, such as gears and bearings in mechanical systems, using handtools.
• Reassembles and starts machines to test performances.
• Dismantles conveyor systems, using handtools.
• Repairs or replaces defective parts and reassembles conveyors.
• May repair hydraulic and pneumatic systems.